Abrading cylinder



P. A. SOLE ABRADING CYLINDER Filed Dec. 8. 1923 2 Shamm-Shwt 1 NW 13,W24.

P. A. SOLEM ABRADING CYLINDER 2 smMw-smm 2 Filed Dec. 8. 1.923

."maa: A. SOLEM, OF RQ'CKFORJD, ILIINOIS.

ABRADHTG INTER.

' Application {tied December 8, 1928. Serial Ito. crates.

State of Illinois, have invented certain new and useful Improvements inAbrading Cylinders, of which the following is a specification.

This invention relates in general to abrad- W ing and polishingcylinders, and has more I holding means.

articular reference to the means for stretchmg and holding an abradingweb or the like on a cylinder, and to the construction of the cylinderso far as it is related to the web- And, while my improvements in thepresent instance have been especially designed for usein a sander, thatis, a machine for sanding or abrading by means of a rotating cylinderfaced with sandpaper or any suitable abrasive material, it should beunderstood that they are of general application in the stretching andholding of any kind of a web or like facing on a cylinder.-

One of the primary objects ofmy invention is to provide a device of thecharacter in which the rim of the cylinder has a relatively narrowlongitudinal opening through which the ends of the abrading web areassed to the interior and anchored, it bemg apparent that the narrowerthe opening the greater will be the amount of abrading surface presentedfor action; and furthermore, to provide a com act means for holding theends of the web and for stretching the web on the cylinder, this meansbeing so constructed that the ends of the web need only extend but ashort distance within the cylinder; thus effecting economy in abrasivematerial, and the web-holding and stretching means occupy acomparatively small space yet allow and provide for a large stretchingmovement.

' Another object is to provide for quick and easy setting and adjustmentof the abrading web 'so as to require the least amount of time andattention on the part of the operator. I

I have also aimed to provide a device as described which is constructedin such simple and novel manner as to be thoroughly practical andsatisfactory for the purposes intended, and which may be produced at acomparatively low cost- Other objects and attendant advantages will beappreciated by those skilled in this art as the invention becomes betterunderstood by reference to the following description when considered inconnection with the accompanying drawings, in which- Figure 1 is an endelevation of an abrading cylinder embodying my invention;

Fig. 2 is a cross-section through the cylinger taken substantially onthe line 2-2 of Fig. 3 is a detail section taken on the line 3--3 ofFig. 1;

Fig. 4 is a fragmentary detail showing the mounting of the stationaryjaw on one of the disk frame members;

Fig. 5 is a longitudinal sectional view throu h-the cylinder takensubstantially on the lin 55 of Fig. 1;

Fig. 6 is anv elevation of one of the tension-imposing arms; a

Fig. 7 is an edge view of said arm;

Fig. 8 is an elevation of one of the swivel jaw-carrying arms; and Fig.v9 is an edge view thereof.

The cylinder shown in the drawings is of the type used in a sandingmachine, and comprises a rim. 11 supported by a pair of disk framemembers or spiders 12 and 13 in turn mounted on and fixed to a maindriving and supporting shaft 14:. A greater number of disk frame membersmay be employed, the number of intermediate members depending on thelength of the cylinder. In the rim of the cylinder, there is formed acomparatively narrow longitudinal slot or opening 15 reaching in thiscase from end to end thereof, through which opening the ends 16 of anabrading web 17 are adapted to be passed or threaded to the interior foranchorage. The web may be laid directly on the rim or upon a suitablecushion covering 18.

The web-holding means comprises in its preferred embodiment a pair ofjaws 19 and 21 reaching substantil'i from end to as at 22, Fig. 4,providing clearance for the jaws, and is shaped to provide a wide seator supporting part 23, as shown plainly in Fig. 5, to which the fixed orstationary jaw is rigidly attached. It will be observed that this aw ispositioned relatively close to the periphery of the cylinder so that theends of t e web,which are waste, will be as short 4 v as 'ssible.

. the trum 1ions for supporting certain partswhich'wlll .be describedhereinafter.

' cent framemember .he aw 21 is movable with respect to the stationaryjaw 19 for the purpose of clamping and releasing the web .end; and meansis provided operable, from one end of the cylinder for quickly andeasily moving the jaw- 21 in a clamping and releasing action andforholding it fixed-in the clamping position. This comprises a plurality ofarms 24, two in the present instance, concentrically mounted on theframe members 12 and 13. I prefer to provide each arm '-.24 with atrunnion 25- journaled in the adjaas shown in Fig. 5, and to mount ashaft 26 concentrically within Each arm 24 has at its outer end, alaterally reach ing supporting part'27 to which the jaw. 21

'is fixedly attached.- The shaft 26-is held against axial displacementby suitable means,

. sired clamping action,

I 29 mounted for rotation bars 12 and 13 and held against axial trans.lation therein.

such as cotter pins. 4

In order to move the arms 24 in the de- I employ a rotary cam 28, Figs.1 and 3, acting against the rear face of said arms and being fixed to ashaft in the'frame mem- One end, of the shaft29 is uared, as shown inFig. 1, for attachment il a spanner wrench or the like, adapted to beused by the operator for revolving the cams and moving the jaw 21 eitherin a clampin or a releasingaction. In view of length of the cylinder,and, in

the gra ual incline of the cam faces and of the wedging action imposedthereby when tightening the jaws, the movable jaw will e automaticallylocked and held in its set, clamping position.

In order to stretch the web on the cylinder after clamping the endsbetween the jaws in the mannerjust described, I provide a pair oftension-imposing or stretching bars 32 and 33 positioned intermediatethe jaws and the periphery of the cylinder with the end ortions ofthe'web between them. These 'Ears likewise extend substantiall the full4 e present vided to' offset the shaft 29,

embodiment, are angular in cross-section. Said bars are carried by atleast two pairs of arms or levers 34 and 35 pivotally mounted on thesupporting shaft 26 above mentioned and each having an operatingend 36disposed at one side of a diametrical plane. passing through the shaft26, and an operated end 37 on the opposite side of said plane. Thetension-imposing bars 32 and 33 are respectively rigidly attached to andcarried by the adjacent ends 36 of said levers. A contractile spring 38connecting the operating ends 37 of the levers 34 and 35 constantlyurges said'levers in a direction to thrust the bars 32 and 33 againstthe interposed web portions, thereby taking up the slack in the Web andfunctioning to stretch the web over the cylinder. The tension bars maybe separated, that is, Withdrawn from the web, by the action ofspreading or separating the operating ends 36 of the levers 34 and 35against the pressure of the spring 38. This is done by means of anexpander cam 39 interposed between the'ends 37 of said levers and fixedto a shaft 41 adapted to be rotated from one end for putting the tensionlevers into or out of action. As shown in Fig. 2, the cam 39 is in theposition holding the tension bars 32 and 33 out of action; and *it' willbe manifest that upon turning "the shaft 41 sufliciently to-withdraw thecam 39 from the end 37, the spring 38 will be permitted to function forpressin the said tension bars against the webh uitable means suchascotter-pins 42 through the shaft, 26 hold the levers 34 and 35 againstdisplacement thereon.

. 'It will be observed that the web-holding and clamping means areso-constructed and arranged that the cylinder is counterbalanced, thusproducing smooth running, and preventing uneven wear on the bearings'for the shaft 14. Additional weight is pro-- at'present this being inthe form of a rod 33 diametrically opposite from said shaft.

1 While in the foregoing, I have illustrated a single working embodimentof my invention, it should be understood that in its roader aspectvarious cha es might be made in details of construction, although thepresent form is thoroughly practicaland has many advantages over the useof certain substitute parts or elementsof which I am aware. For example,clamping rollers might be used in place of the jaws 19 and 21;

the tension-imposing members, although that shown is well balanced. iseasily oper-ated for releasing the tension and functions automaticallyto impose the tension.

It will be further observed that the holding and stretching elements areso relatively upright flange of eachangle bar 32 and 33 is positioned toengage. the webrelatively close to the periphery of'the'rim, whereby topull almost directly in the peripheral plane when stretching the web.'This obviously imposes less strain on the web and requires lesspressure than in those' constructions in which the inturned ends of thewebs are at less of anobtuse angle and in which the stretching pull isfrom a point closer to the center of the cylinder. Because of the natureof the jaws employed, the ends of the webs will be held in a powerfulviselike grip, positively preventing them from being withdrawn. It willbe further observed that the" work may be quickly removed. from ormounted upon the cylinder, these operations requiring only a simplemanipulation of the shafts 29 and 41 from one end of the cylinder.

It is believedthat the foregoing conveys a clear understanding of theobjects prefaced above; and while I have shown in the drawings forpurpose of illustration, 5

but a single working embodiment, it will be manifest that many changesmight be-made in the construction and arrangement without departing fromthe spirit and scope of the invention as expressed in the appendedclaims, in which--' I claim: I 1. In an abrading cylinder, thecombination of a rim having an opening throughv which the ends of a webmay be threaded to the interior, coacting jaws for holding said endswithin the cylinder, and oppositely disposed tightening elements forengaging the interposed. portions of the web between said jaws and therim for tighten ing the web on the rim.

2. In an abrading cylinder, the combination of a rim having an openingthrough which the ends of a web may be threaded to the interior,oppositely disposed webstretching elements underneath the lips of saidopeninggand means underneath said stretching means for clamping andholding the ends of the web.

3. In an abrading cylinder, the combination of a' rim having an openingthrou h which the ends of a web are adapted-to In: threaded to'theinterior, means for clamping'and holding said ends, oppositely dlsposedcoacting bars for imparting pressure against the web portions betweensaid clamping means and the rim for tightening the webon the rim, meansconstantly urging said bars in a web tightening movement,

and means for withdrawing said bars.

4. A device "of the character described comprising a rotary cylinder,the rim of which has anarrow longitudinal opening, a

web the ends of which are adapted to be passed through said opening tothe interior of the cylinder, a pair of opposed jaws for grlppingsaidends substantially throughout their length, one of said jaws beingstationary and the other movable in an opening and closing action, meansfor so moving'the latter jaw, a pair of opposed ten- -tion-imp osingmembers positioned intermediate the cylinder rim and said jaws with theweb ends interposed, and means for pressing said members togetheragainst the interposed web ends for stretching the web on the cylinder.

' 5. In a devlce .of the character described,

the combination of a cylinder. the rim of which has a narrowlongitudinal opening for the reception of the ends of a web on thecylinder, means within the cylinder for holding said ends of the web,and a pair of web-stretching elements located between the web-holdingmeans and the periphery of the rimwith the 'web ends interposed andpositioned for engaging said web ends close to said periphery, and meansfor relatively moving said elements'toward and from each other in a webstretching and a releasing ,110

movement.

6.'In a device of the character described, the combination ofacylinderhavin an opening in its rim for the reception 0 the ends of aweb, means within the cylinder for clamping and holding said ends, apair of levers pivoted within the cylinder substantially in the radialplane of said clamping means, each lever having an operating enddisposed at one side of a diametrical plane and intersecting its pivotaxis and an operated end at the opposite side of said diametrical plane,a web engaging element on the operated end of each lever, and meansoperative between the operating ends of 'said levers for moving saidelements in'a webstretching and a releasing movement.

7. A device of the character described comprising a rim having'alongitudinal opening through which the-ends of a web a plurality oiaxially spaced frame members supporting said rim, a' jaw bar arallelwith and in the radial plane of sai opening and fixedly mounted on saidframe members, ashaft disposed similarly to said jaw and mounted on saidframe members, a

plurality of arms pivotally mounted on said shaft and equipped at theirouter ends with a jaw bar adapted to coact with said fixed jaw bar forclamping and holding the ends 10 of the Web, oppositely disposedweb-tightener bars intermediate'said jaw' bars and the rim, and meanspivotally supporting said web-tightener bars on said shaft.

PETER A. SOLEM.

